Effect of soil temperature and pH on resistance of soybean to Heterodera glycines

Anand, S.C. and Matson, K.W. and Sharma, S.B. (1995) Effect of soil temperature and pH on resistance of soybean to Heterodera glycines. Journal of Nematology, 27 (4). pp. 478-482.

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Soybean cyst nematode (SCN), Heterodera glycines Ichinohe, is a major pest of soybean, Glycine max L. Merr. Soybean cultivars resistant to SCN are commonly grown in nematode-infested fields. The objective of this study was to examine the stability of SCN resistance in soybean genotypes at different soil temperatures and pH levels. Reactions of five SCN-resistant genotypes, Peking, Plant Introduction (PI) 88788, Custer, Bedford, and Forrest, to SCN races 3, 5, and 14 were studied at 20, 26, and 32 C, and at soil pH's 5.5, 6.5, and 7.5. Soybean cultivar Essex was included as a susceptible check. Temperature, SCN race, soybean genotype, and their interactions significantly affected SCN reproduction. The effect of temperature on reproduction was quadratic with the three races producing significantly greater numbers O f cysts at 26 C; however, reproduction on resistant genotypes remained at a low level. Higher numbers of females matured at the soil pH levels of 6.5 and 7.5 than at pH 5.5. Across the ranges of temperature and soil pH studied, resistance to SCN in the soybean genotypes remained stable.

Item Type: Article
Author Affiliation: Missouri Agricultural Experiment Station, Columbia, MO
Subjects: Plant Protection > Pests
Soil Science and Microbiology > Soil Sciences
Divisions: Soyabean
Depositing User: Sandhya Gir
Date Deposited: 11 Jan 2011 22:59
Last Modified: 11 Jan 2011 23:00
URI: http://eprints.icrisat.ac.in/id/eprint/1350

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